Lincoln Electric IM10076 LN-25 PRO - Manual (Page 37)

E-4 TROubLEShOOTING E-4
LN-25™ PRO
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAuTION
PRObLEMS
(SYMPTOMS)
POSSIbLE
CAuSE
RECOMMENDED
COuRSE OF ACTION
Variable or "hunting" arc.
Poor arc starts with sticking or
"blast-offs", weld porosity, narrow
and ropy looking bead.
1. Wrong size, worn and/or melted
contact tip.
2. Worn work cable or poor work
connection.
3. Wrong polarity.
4. The gas nozzle is extended
beyond the contact tip or the wire
stickout is too long.
5. Poor gas shielding on processes
requiring gas.
1. Improper procedures or tech-
niques.
1. Replace the contact tip.
2. Verify all work and electrode con-
nections are tight and that the
cables are in good condition.
Clean/replace as necessary.
3. Adjust polarity to the recommend-
ed procedure.
4. Adjust the gas nozzle and shorten
the stickout to 3/8 to 1/2 inches.
5. Check gas flow and mixture.
Remove or block sources of
drafts.
1. See "Gas Metal Arc Welding
Guide" (GS-100).
Output Problems